android - Cast exception in eclipse designer -

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how solve exception in eclipse designer when placing custom view in another.

java.lang.classcastexception: com.fitness.app.stopper cannot cast android.widget.button @ com.fitness.app.stopper.<init>(stopper.java:25).

com.fitness.app.stopper xml:

<merge xmlns:android="http://schemas.android.com/apk/res/android" >  <button     android:id="@+id/btnstartstopper"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_alignparentleft="true"     android:layout_alignparenttop="true"     android:layout_margintop="25dp"     android:text="start"      />  <chronometer     android:id="@+id/chronometer1"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_aligntop="@+id/btnstartstopper"     android:layout_marginleft="18dp"     android:layout_torightof="@+id/btnstartstopper"     android:text="chronometer"     android:textsize="45sp" />  </merge>

and com.fitness.app.stopper line 25 error: button btnstart = (button) findviewbyid(r.id.btnstartstopper);

    public class stopper extends linearlayout {  private chronometer stopper; private boolean stopper_started = false;  public stopper(context context) {     super(context); }  public stopper(context context, attributeset attrs) {     super(context, attrs);     initializelayoutbasics(context);             this.stopper = (chronometer) findviewbyid(r.id.chronometer1);     button btnstart = (button) findviewbyid(r.id.btnstartstopper);     btnstart.setonclicklistener(new onclicklistener() {          @override         public void onclick(view arg0) {             startorstopstopper(arg0);         }     }); }  private void initializelayoutbasics(context context) {     setorientation(horizontal);     final layoutinflater inflater = (layoutinflater) context.getsystemservice(context.layout_inflater_service);     inflater.inflate(r.layout.fragment_stopper, this, true);//todo change name fragment different }  public void startorstopstopper(view v) {     if(!stopper_started)         stopper.start();     else         stopper.stop();      stopper_started = !stopper_started; }

}


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